利用非均匀外载数值模拟法优化盐间油藏套管类型

Optimization of Casing Type in Inter-salt Reservoir via Numerical Simulation of Non-uniform External Load

韩玲

HAN Ling

中国石油化工股份有限公司江汉油田分公司石油工程技术研究院, 湖北武汉 430000

Petroleum Engineering Technology Research Institute, SINOPEC Jianghan Oilfield Company, Wuhai Hubei 430000, China

此文从盐间油藏套管损坏现状出发，分析了套管变形井的力学影响参数。利用现有测井资料、岩石力学参数及水力压裂参数建立与垂向地应力、水平地应力和蠕变外载力相关的非均匀载荷计算模型，然后利用非均匀外载与套管屈服强度、套管等效强度及径厚比的转换关系，计算出套管变形状态下的等效破坏载荷和应具备的抗挤强度，最后优选出适合盐间油藏不同区块的套管类型。通过非均匀外载数值模拟法研究，定量分析了盐间油藏套管损坏的力学机理，形成了一套适合盐间油藏套管优选的理论计算方法，对国内外相似油田也起到了一定的指导作用。

Based on the present situation of casing damage in the inter-salt reservoirs, the author studied the mechanical parameters which cause the deformation of casing in the well. First of all, the non-uniform load calculation model which is related with the vertical crustal stress, horizontal crustal stress and creep load was established by using the available logging data, rock mechanical parameters and hydraulic fracturing parameters. And then, the equivalent collapse resistance under the condition of the casing deformation and the necessary compressive strength were calculated via using the transformation relationship between the non-uniform load and the yield strength of casing, the equivalent casing strength and the ratio of diameter to thickness. Finally, the casing type suitable for the inter-salt reservoirs in different blocks was optimized. Based on the numerical simulation of non-uniform external load, the author quantitatively analyzed the mechanical mechanism for the casing damage in the inter-salt reservoirs, proposed a theoretical calculation method for the optimization of casing type suitable for the inter-salt reservoirs.

https://doi.org/10.3969/j.issn.1008-2336.2017.01.043